Filter



F. J. WOOD Feb. 24, 1942.

FILTER Filed May 24, 1939 r 2 515 mT Es A INVENTOR. Y Earp. J: H7000Zfc% ATTORNEYS.

Patented Feb. 24, 1942 This invention relatesto filters and moreparticularly to filters adapted to be placed in a liquid line to removeforeign. particles from liquid flowing therethrough.

One of the objectsof the invention is to provide a filter which issimple and inexpensive to construct and assemble and which is emcienftand reliable in operation. 7 a

Another object of the invention is to provide a filter having aninterchangeable filtering element which can be changed quickly andeasily and which is secured incplace without the necessity of anycomplicated fastenings. According to one important feature the filterelement includes a spring which acts as a support for the filteringmaterial and also to hold the filter element in position in the casing.

Still another object of the inyention-is-to'provide a filter elementwhich is resilient lengthwise so as to seal itself in a filter casing.

Otherobjects, advantages and novel features of the invention will beapparent from the following description of the embodiment shown in theaccompanying drawing, in which:

Figure l is a central section of a filter embodying the invention;

Figure-2 is an elevation of a filtering element with parts broken away;

Figure 3 is a side view of the spring;

Figure 4 is a top view of the spring; and

Figure 5 is a partial section similar to Figure 1 illustrating amodified construction.

The filter of Figure 1 comprises a lower casing half III which may be adie casting or the like and which is formed at its lower end withtapered openings i2 and i4. .The opening 12 is arranged axially of thecasing and is formed with a tubular projection I6 extending upwardlyinto the casing. The casing is completed by upper half l8 formed to seataround the upper edge of the cas-' ing half Ill with a sealing gaskettherebetween. A boss 22 is cast axially into the upper end of the casinghalf l8-and is formed with a bore thereto for a purpose to appearhereinafter.

The casing halves are secured together by means of a bolt 24 secured atone end into an elbow 26 screw-threaded into the opening l2. A crown nut23 is screwed on the upper end of the bolt 24 and presses the casinghalf [8 tightly against the washer 20'.

The casing contains a filtering element shown as comprising a tube orbag of cloth material or the like so having openingsdn its ends around Awhich the material'is gathered by grommets or eyelets 32 having aninternal diameter substanless than the internal diameter of the. casingand tially the same as the diameter of the bosses I and 22. Suitablewashers of felt,;or the like 34 are secured to theouter surfaces of theeyelets 32 and are adapted to be pressed sealingly against the ends ofthe casing. The filtering bag is supported by a coil spring 36 of adiameter of a free length greaterrthan the length of the casing. .At itends the-spring 36 converges and terminates in closed rings 33 ofsubstantially the same internal diameter as the eyelets 32.

The bag is of a length greater than the free length of the spring andstrings 40 aresecured in place by the eyelets 32 and may be wound aroundthe bag to draw it into the convolutions of the spring as best seen inFigures 1 and 5;" 4

When the filtering element is placed in the casing and the casing top I!is drawn down, the

spring will becompressed lengthwise and will press the washers 34against. the ends of the casing around the bosses l6 and 22. Thesebosses engage the rings 38 and serve to hold the spring in alignment inthe casing. Due to compression of the spring, when the filter element isplaced in the casing, no additional fastening or sealing means isnecessary.

In use fluid to be filtered may enter one of the openings l2 or H andfiow out through the other after passing through the filtering element.Preferably the fiuid enters the opening l2 and flows through the boss Itso that all material removed from the fluid will be retained inside thefiltering element and the interior of the casing will be kept clean.When a filtering element becomes dirty it may be replaced merely byunscrewing the nut 28, removing the old element, slipping a new elementover the bolt 24 with one of the'eyelets 32 and rings 38 around the bossI6 and replacing the casing half l8 and the nut.

Figure 5 illustrates a modified casing construction in which the casingincludes a lower half 42 formed with lugs 44 at its upper peripherythreaded to receive fastening bolts 46. The upper casing half 48 has aclosed upper end formed with a central boss 50 of a diameter to fit intothe eyelet 32 and ring 38 and has peripheral lugs 52 through whichthe'screws 46 may pass. j

It will be apparent that other types offastening means might be employedand that numerous other changes might be made without departing from thescope of the invention. It is, therefore,

not intended that the form shown on the drawing shall be taken as adefinition of the limits purpose to the appended claims.

'mate' .e endilfitmed 02,

1. a C WS-"m8 of the invention, reierence being had {or What is claimedis: 1, 1. A filter comprising a teriai in said casing having anopeningzin'one end to fit over said boss, and a coil sprinz' in'said.

casmg :ior'med with, an axial tubular boss at' one end andjhaving an}; ping spa dir m said boss, said host and openingp'roviding inlet andoutiet'ope'nin'gs for}. fiuid to be filtered, a'fiexiblebag'otffiitering mar this I ,1: the tube-within the cloth tube orsmailer-diam- Tm bag compressed againstthe ends of 'tne'cwn rztingaround said-boss and pressing the bag into sealing engagement withtheendor the casing around theboss.

2. A filter comprisinga casing formed with an axial tubular boss at oneend and having an and having an annular portion at one end fit!openingspaced lromfsaid-boss, said boss and":

ditoghe'filtered, a flexible bag of filtering inlsaidjcasjingihaving aneyelet in one closely around said boss, and d, ag jcompressed againstthe in off a diameter to fit closel aro arid pressing said eyelet agaasing' around the boss.

. a'casing formed .with.

'anone-end and havinganf id boss, said boss an and'outlet openings f opnin 1 a flexible bag of filtering bpeningproviding inlet and outletopenings for A filter compriaing a casing having a iemovablehead; bossesprotruding within the casing fa t-;1the ;.center otthe head and in thecenter lol'fthe "opposite xend ot the casing, a passage th oilsh onel'pgsaid bosses; a filter cloth tube. 1,-1ong'er;than:ithefl.easing havingits ends'drawn tog'etheri;witheyelets.and a cord attached, a

spring longer'than-the casing and shorter than eterthanthe' inside otthecasing, said spring having its ends converging and terminating ineclosedring'slot the sameginside diameter as the .eyeletsat the:end'a'oithecioth tube and concentric wan "and perpendicular to the axisof Y the "spring, resilient washers around the bosses, said eyelets andclosed rings fittings over the bosses respectively, and means fasteningthe removable headfto-ma'ke ititight against the body or the casing andcompress the spring to hold the eyelets against theresilient washers. ji

*5. A filter comprising a two part casing formed- J with fiat endshavingcentral internally projecting bosses, one ot said-bosses being termedwith flan opening ,therethrough communicating with {theinteriorotthe'casing, a tube of filtering ma- ,teriaif-in -saidcasinghaving eyelets inits ends fittingnver said bosses, a coil spring in saidtube 7 e ds: cflh ij' 'as ps an e mina at one end,

materialfln-"said casing having eyelets in its ends of a diaiiieter' tofit closely arou'nd'said boss, a coil spring-in said'b'ag compressedagainst-i the ends oi. the casing and having its ends converging andterminating in closed rings of substantially the "same diameter as theeyelets, one of said eyelets and-rings fitting over the boss, and meansat the other end of the casing entering the other. eyelet. and-ring tocenter thespring and .b s inthe c si termi ating; at its ends in closedrings fitting an bosses and pressing the eyelets against the casing, andmeans for fastening msof the-casing together to compress thespringbetween the oasingends, and said ,means'fincluding' a boltextending through both of said bosses, nut secured to the bolt andeng'agingone end of the casing topress'the casing'parts together, saidcasing being formed with an opening spaced from the-bosses, said openingand the opening through said one of the bosses providing inlet andoutlet openings for fiuid to be filtered. I

